NEW ALLISON TC10 TRACTOR TRANSMISSION AVAILABLE FOR ORDER AT NAVISTAR

Transmission that averages 5% fuel savings will now be offered on Navistar’s International ProStar and TranStar models.

INDIANAPOLIS, Oct 17, 2013 – Allison Transmission Holdings Inc. (NYSE: ALSN) today announced that the new TC10™ tractor transmission is now offered on Navistar’s International® ProStar® and TranStar® models with MaxxForce™ 13 engines with SCR. This is the first offering of the fully automatic TC10. Navistar began accepting orders on October 15, 2013 and expects initial deliveries to occur in the first quarter of 2014.

“The Allison TC10 is an innovative and efficient option that demonstrates our commitment to our International Truck customers,” said Nadine Haupt, director of alternative fuels and heavy duty on highway product marketing, Navistar. “Fleets that rely on the TranStar and ProStar models will find that spec’ing them with an Allison TC10 will further their fuel savings and operational goals.”

Test fleet users achieved an average 5 percent fuel economy improvement with the Allison TC10 tractor transmission over their current manual and automated manual transmissions.

The TC10 is specifically designed for both city and highway tractor duty cycles and provides a blended architecture with full power shifts, a torque converter and a twin countershaft gear box. It is fully automatic and offers smooth, seamless shifting through 10 ranges. This optimizes acceleration and fuel economy, making the transmission especially ideal for distribution applications where a tractor-trailer splits its work cycle between city and highway conditions.

“We have a long history of successful initiatives with Navistar and this launch of the TC10 into the tractor market furthers that model,” said Jim Wanaselja, vice president of North America marketing, sales and service for Allison Transmission. “The TC10’s cutting edge transmission technology, paired with Navistar’s offerings, will allow fleets the ability to save fuel while enjoying the performance, durability and reduced maintenance that the industry has come to expect from Allison Automatics.”

Rated up to 600 horsepower and 1,700 pound-feet of torque at launch, the TC10 is designed with 10 forward speeds and two reverse. It comes equipped with Allison’s newest generation of electronic controls which provide superior fuel economy features, prognostics to eliminate unnecessary oil and filter changes, and enhanced shift selector functionality. A five-year or 750,000 mile warranty is also included.

For more information visit www.AllisonTC10.com or contact your local International truck dealer by visiting www.internationaltrucks.com/dealerlocator

About Allison Transmission   
Allison Transmission (NYSE: ALSN) is the world’s largest manufacturer of fully automatic transmissions for medium- and heavy-duty commercial vehicles and hybrid-propulsion systems for city buses. Allison transmissions are used in a variety of applications including refuse, construction, fire, distribution, bus, motorhomes, defense and energy. Founded in 1915, the company is headquartered in Indianapolis, Indiana, USA and employs approximately 2,800 people worldwide. With a market presence in more than 80 countries, Allison has regional headquarters in the Netherlands, China and Brazil with manufacturing facilities in the U.S., Hungary and India.  Allison also has approximately 1,400 independent distributor and dealer locations worldwide. For more information, visit allisontransmission.com.

Forward-Looking Statements   
This press release may contain forward-looking statements. All statements other than statements of historical fact contained in this press release are forward-looking statements. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expect,” “plans,” “project,” “anticipate,” “believe,” “estimate,” “predict,” “intend,” “forecast,” “could,” “potential,” “continue” or the negative of these terms or other similar terms or phrases. Forward-looking statements are not guarantees of future performance and involve known and unknown risks. Factors which may cause the actual results to differ materially from those anticipated at the time the forward-looking statements are made include, but are not limited to: risks related to our substantial indebtedness; our participation in markets that are competitive; general economic and industry conditions; our ability to prepare for, respond to and successfully achieve our objectives relating to technological and market developments and changing customer needs; the failure of markets outside North America to increase adoption of fully-automatic transmissions; the discovery of defects in our products, resulting in delays in new model launches, recall campaigns and/or increased warranty costs and reduction in future sales or damage to our brand and reputation; the concentration of our net sales in our top five customers and the loss of any one of these; risks associated with our international operations; brand and reputational risks; our intention to pay dividends; and labor strikes, work stoppages or similar labor disputes, which could significantly disrupt our operations or those of our principal customers. Although we believe the expectations reflected in such forward-looking statements are based upon reasonable assumptions, we can give no assurance that the expectations will be attained or that any deviation will not be material. All information is as of the date of this press release, and we undertake no obligation to update any forward-looking statement to conform the statement to actual results or changes in expectations.

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